312001230 - N079 PARKING DEVICE NOT WORKING

The ultrasound distance detection system for parking provides the driver with information on distance while approaching obstacles behind the car. The information of the presence and distance of an obstacle is transmitted to the driver by means of acoustic warnings whose frequency depends on the distance of the obstacle. The distance measurement only takes place when the system is activated, whilst only the control unit microcontroller is operational in the inactive state.

The system is activated with the key ON and reverse engaged. The Parking Sensor Node receives a reversing signal from the Body Computer Node via the CAN line.

		Test results
1	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the Examiner diagnostic equipment and check the following data in CAN mode: no "control unit inactive" signal no "faulty control units" signal no "faulty CAN line" signal Check for faults in the parking sensor node	Move on to Step 2	1. Control unit inactive2. Control unit error3. Control units with CAN line error	1. Move on to Step 22. Continue as instructed by the diagnostic equipment3. Repair any faults in the CAN line
2	CONTROL UNIT POWER SUPPLY CHECK	All OK	Problems encountered	Operation
	Check the parking sensor node power supply voltage is correct by carrying outSee Test	Move on to Step 3	1. Fuse blown2. Power supply inefficient3. Earth inefficient	1. 1.Eliminate any short circuits and then replace fuse F49 in the dashboard junction unit.2. Restore correct power supply3. Restore earth connection    See E3090 PARKING SENSOR
3	REVERSING SWITCH CHECK	All OK	Problems encountered	Operation
	Check that the reversing switch is working properlyCheck the continuity of the wiring between the switch and the engine compartment junction unitCheck that the reversing switch is receiving the correct power supply	Move on to Step 4	1. Reversing switch defective2. Wiring from reversing switch to Body Computer interrupted3. Wiring from engine compartment junction unit to reversing switch interrupted4. Switch power supply interrupted	1. Replace the reversing switch    Op. 5550D22 REVERSING LIGHT SWITCH - R+R 2. Restore the correct wiring continuity.3. Restore the correct wiring continuity.4. Restore correct power supply.
4	CHECK SYSTEM EFFICIENCY	All OK	Problems encountered	Operation
	Check the continuity/insulation of the ultrasound sensors circuitCheck that the ultrasound sensors power supply is correct by carrying out    See Test 5580HB PARKING SENSOR SYSTEM OPERATION CHECK	End of diagnosis	1. Sensor wiring defective2. Sensor power supply interrupted3. Sensors defective4. Parking sensor control unit defective	1. Repair wiring.2. Restore correct power supply.3. Replace defective sensor.4. Replace parking sensors control unit    Op. 5580H10 PARKING OBSTACLE DETECTION DEVICE ELECTRONIC CONTROL UNIT - R.R.